class Person:
    def __init__(self,name,weight):
        self.name = name
        self.weight = weight
    def __str__(self):
        return "我的名字叫 %s 体重是 %.2f 公斤" % (self.name,self.weight)

    def run(self):
        print("%s 爱跑步，跑步锻炼身体" % self.name)
        self.weight -= 0.5
    def eat(self):
        print("%s 是吃货，吃完这顿再减肥" % self.name)
        self.weight += 1.5
xiaoming = Person("小明",78.0)
xiaoming.run()
print(xiaoming)
xiaoming.eat()
print(xiaoming)


xiaomei = Person("小美",45)
xiaomei.eat()
xiaomei.run()
print(xiaomei)